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A048193
as a simple table
n
a(n)
1
1
2
2
3
4
4
10
5
27
6
94
7
393
8
2119
9
14524
10
126758
11
1392387
12
19109099
13
326005775
14
6905776799
15
181945055235
[1,2,4,10,27,94,393,2119,14524,126758,1392387, 19109099,326005775,6905776799,181945055235]